Uneven progress: The advancing science of dental hygiene education versus stagnation in dental curricula

Over the past two decades, dental hygiene education in the US has undergone transformative change. Guided by updated Commission on Dental Accreditation (CODA) standards, hygiene curricula now integrate evidence-based science, neuroscience-informed learning, interprofessional collaboration, and advanced clinical competencies in nonsurgical periodontal therapy. In contrast, predoctoral dental curricula have evolved incrementally, retaining an emphasis on restorative and surgical procedures while offering limited formal instruction in preventive and behavioral sciences.

This article argues that the scientific and pedagogical sophistication of dental hygiene education has surpassed that of dental education in areas of prevention, instrumentation, and patient-centered care—creating a curricular imbalance that undermines the efficiency and equity of the oral-health workforce.

Also by the author: The advancing science of dental hygiene education

The evolution of dental hygiene science and education

Dental hygiene emerged in the early twentieth century as an auxiliary profession devoted to prophylaxis and prevention. Since then, its science and educational scope have advanced dramatically. Today’s hygienists are prepared to perform comprehensive assessment, diagnosis, treatment, and evaluation of nonsurgical periodontal therapy across the continuum of disease.¹ Most accredited programs require between 1,800 and 2,000 total instructional hours, with roughly one-third devoted to clinical instrumentation and periodontal management.

Contemporary dental hygiene curricula emphasize:

Evidence-based practice (EBP): Students critically appraise literature and apply findings to individualized care decisions.

Advanced technologies: Power instrumentation, silver diamine fluoride (SDF), and minimally invasive caries-management techniques

Behavioral and neuroscientific learning: Motivational interviewing, reflective journaling, and metacognitive skill development²

Interprofessional collaboration: Integration with nursing, public health, and social-work students to address determinants of health

These advances position hygienists as primary prevention specialists, capable of autonomous, evidence-driven decision-making within community and clinical settings. The pedagogical structure mirrors contemporary adult-learning principles—self-directed learning, experiential reflection, and competency-based progression.³

Dental education: A slower evolution

Predoctoral dental education, while comprehensive, remains grounded in a restorative paradigm established more than 50 years ago. CODA’s Accreditation Standards for Predoctoral Dental Education Programs⁴ emphasize biomedical science, diagnosis, and surgical intervention but allocate relatively little curricular time to nonsurgical periodontal therapy or prevention. National surveys reveal that dental students receive fewer than 100 clinical hours in scaling and root planing, compared to 400–600 hours in dental hygiene programs.⁵

Although dental students are expected to “promote oral health and disease prevention,” the standards do not specify measurable competencies in motivational interviewing, health coaching, or behavior change. Preventive dentistry is often taught as an ancillary lecture series rather than as a longitudinal, competency-based sequence. Consequently, dental graduates may enter practice less prepared to perform or supervise preventive care effectively—a gap increasingly apparent in the shift toward value-based and population-health models (table 1).

The consequences of curricular imbalance

This divergence carries profound implications. As dentistry faces workforce shortages and widening disparities in oral-health access, hygienists increasingly deliver frontline preventive care in community clinics, schools, and long-term care facilities. Yet, dental graduates—who are expected to supervise or collaborate with these professionals—often lack equivalent training in the very preventive modalities central to today’s oral-health delivery system.

The result is a hierarchical incongruity: hygienists are highly trained in nonsurgical, evidence-based care, while dentists—whose education confers ultimate clinical authority—may have minimal exposure to such approaches. This imbalance restricts collaborative efficiency, limits the profession’s preventive impact, and perpetuates outdated models of care that prioritize restoration over preservation.

Pedagogical progress in dental hygiene

Modern dental hygiene programs have embraced competency-based education (CBE) long before many dental schools adopted similar frameworks. CODA’s hygiene standards explicitly define competencies, outcomes, and psychomotor benchmarks, requiring demonstration of mastery prior to graduation.

Instructional design reflects adult-learning theory^3,6:

Experiential scaffolding: Students progress from simulation to live-patient care under guided reflection.

Metacognitive feedback: Journals, peer review, and self-assessment cultivate reflective practitioners.

Interdisciplinary assessment: Clinical decision-making integrates pharmacology, radiology, and periodontology, mirroring authentic clinical complexity.

In contrast, dental education often measures progress through procedural quotas (e.g., number of restorations or extractions), a legacy of apprenticeship models that prioritize production over reflection. The hygienist’s pedagogical framework—rooted in neuroscience and adult-learning principles—may therefore represent a more contemporary model for professional formation across oral health disciplines.

Toward integrated reform

Reform efforts must recognize that oral-health outcomes depend on preventive competence as much as restorative skill. Modernizing dental curricula requires aligning them with the preventive science already embedded in dental hygiene education. This means:

Embedding nonsurgical periodontal competencies within all predoctoral programs, not as electives but as measurable graduation requirements

Integrating interprofessional and behavioral science instruction, including motivational interviewing and health-coaching certification

Expanding faculty development in adult-learning theory, simulation pedagogy, and formative assessment

Leveraging dental hygiene faculty expertise to redesign prevention curricula for dental students—bridging the artificial divide between “doctor” and “hygienist”

If the dental profession aspires to lead population-health initiatives, it must learn from the educational advances pioneered within dental hygiene.

Conclusion

The evolution of dental hygiene education illustrates a broader truth in health professions education: scientific progress alone does not ensure pedagogical advancement. Hygienists now graduate with refined clinical and cognitive competencies that reflect the latest evidence in prevention, periodontology, and patient behavior. Dental education, meanwhile, remains anchored in a curative model.

Aligning the two requires not diminishing dentistry’s scientific rigor but elevating its preventive and educational dimensions to match the sophistication long demonstrated by the dental hygiene discipline. Only then can oral-health education truly embody a continuum—from prevention to restoration—guided by science, equity, and lifelong learning. 

Editor's note: This article appeared in the April/May 2026 print edition of RDH magazine. Dental hygienists in North America are eligible for a complimentary print subscription. Sign up here.

References

1. Commission on Dental Accreditation (CODA). (2024a). Accreditation standards for dental hygiene education programs. American Dental Association. https://coda.ada.org/-/media/project/ada-organization/ada/coda/files/dental_hygiene_standards.pdf
2. Taylor K, Marienau C. Facilitating Learning With the Adult Brain in Mind. Jossey-Bass; 2016.
3. Brockett RG. Teaching Adults: A Practical Guide for New Teachers. Wiley; 2015.
4. Commission on Dental Accreditation (CODA). (2022). Accreditation standards for predoctoral dental education programs. American Dental Association. https://coda.ada.org/-/media/project/ada-organization/ada/coda/files/2022_predoc_standards
5. Herz MM,Schamuhn J, Krumm B, Bartha V. Student-performed periodontal therapy: retrospective cohort study on outcomes and related recommendations for enhancing undergraduate periodontal education. J Dent Educ. 2025;25(1130). doi:10.1186/s12909-025-07699-2
6. Knowles MS. Andragogy in Action: Applying Modern Principles of Adult Learning. Jossey-Bass; 1984.